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      <a href="/2016/12/03/vue2-notes-5-transition-animation/" title="Vue2使用笔记5--transition过渡效果使用" itemprop="url">Vue2使用笔记5--transition过渡效果使用</a>
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#过渡效果"><span class="toc-number">1.</span> <span class="toc-text">过渡效果</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#transition封装组件"><span class="toc-number">1.1.</span> <span class="toc-text">transition封装组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#过渡的-CSS-类名"><span class="toc-number">1.2.</span> <span class="toc-text">过渡的-CSS-类名</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#JavaScript-钩子"><span class="toc-number">1.3.</span> <span class="toc-text">JavaScript 钩子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#多个元素的过渡"><span class="toc-number">1.4.</span> <span class="toc-text">多个元素的过渡</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#添加过渡效果"><span class="toc-number">2.</span> <span class="toc-text">添加过渡效果</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#vue-router过渡动效"><span class="toc-number">2.1.</span> <span class="toc-text">vue-router过渡动效</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Sidebar下拉菜单过渡效果"><span class="toc-number">2.2.</span> <span class="toc-text">Sidebar下拉菜单过渡效果</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#给Services组件简单添加列表过渡效果"><span class="toc-number">2.3.</span> <span class="toc-text">给Services组件简单添加列表过渡效果</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近在使用Vue2作为项目中前端的框架，《Vue2使用笔记》系列用于记录过程中的一些使用和解决方法。<br>本文记录vue中过渡效果，以及在路由切换以及下拉菜单中的使用过程。<br><a id="more"></a></p>
<h2 id="过渡效果"><a href="#过渡效果" class="headerlink" title="过渡效果"></a>过渡效果</h2><hr>
<p>Vue 在插入、更新或者移除 DOM 时，提供多种不同方式的应用过渡效果。<br>包括以下工具：</p>
<ul>
<li>在CSS过渡和动画中自动应用class</li>
<li>可以配合使用第三方CSS动画库，如Animate.css</li>
<li>在过渡钩子函数中使用JavaScript直接操作DOM</li>
<li>可以配合使用第三方JavaScript动画库，如Velocity.js</li>
</ul>
<h3 id="transition封装组件"><a href="#transition封装组件" class="headerlink" title="transition封装组件"></a>transition封装组件</h3><ul>
<li><p>在下列情形中，可以给任何元素和组件添加entering/leaving过渡</p>
<ul>
<li>条件渲染（使用 v-if）</li>
<li>条件展示（使用 v-show）</li>
<li>动态组件</li>
<li>组件根节点</li>
</ul>
</li>
<li><p>元素封装成过渡组件之后，在遇到插入或删除时，Vue 将</p>
<ul>
<li>自动嗅探目标元素是否有CSS过渡或动画，并在合适时添加/删除CSS类名</li>
<li>如果过渡组件设置了过渡的JavaScript钩子函数，会在相应的阶段调用钩子函数</li>
<li>如果没有找到JavaScript钩子并且也没有检测到CSS过渡/动画，DOM操作（插入/删除）在下一帧中立即执行</li>
</ul>
</li>
</ul>
<h3 id="过渡的-CSS-类名"><a href="#过渡的-CSS-类名" class="headerlink" title="过渡的-CSS-类名"></a>过渡的-CSS-类名</h3><p><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/transition.png" alt="image"><br>有4个(CSS)类名在enter/leave的过渡中切换</p>
<ul>
<li>v-enter<ul>
<li>定义进入过渡的开始状态</li>
<li>在元素被插入时生效，在下一个帧移除</li>
</ul>
</li>
<li>v-enter-active<ul>
<li>定义进入过渡的结束状态</li>
<li>在元素被插入时生效，在 transition/animation 完成之后移除</li>
</ul>
</li>
<li>v-leave<ul>
<li>定义离开过渡的开始状态</li>
<li>在离开过渡被触发时生效，在下一个帧移除。</li>
</ul>
</li>
<li><p>v-leave-active</p>
<ul>
<li>定义离开过渡的结束状态</li>
<li>在离开过渡被触发时生效，在transition/animation完成之后移除</li>
</ul>
</li>
<li><p>自定义过渡类名</p>
<ul>
<li>可以通过以下特性来自定义过渡类名：<ul>
<li>enter-class</li>
<li>enter-active-class</li>
<li>leave-class</li>
<li>leave-active-class</li>
</ul>
</li>
<li>他们的优先级高于普通的类名，这对于Vue的过渡系统和其他第三方CSS动画库，如Animate.css结合使用十分有用</li>
</ul>
</li>
</ul>
<h3 id="JavaScript-钩子"><a href="#JavaScript-钩子" class="headerlink" title="JavaScript 钩子"></a>JavaScript 钩子</h3><figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">transition</span></span></div><div class="line">  <span class="attr">v-on:before-enter</span>=<span class="string">"beforeEnter"</span></div><div class="line">  <span class="attr">v-on:enter</span>=<span class="string">"enter"</span></div><div class="line">  <span class="attr">v-on:after-enter</span>=<span class="string">"afterEnter"</span></div><div class="line">  <span class="attr">v-on:enter-cancelled</span>=<span class="string">"enterCancelled"</span></div><div class="line">  <span class="attr">v-on:before-leave</span>=<span class="string">"beforeLeave"</span></div><div class="line">  <span class="attr">v-on:leave</span>=<span class="string">"leave"</span></div><div class="line">  <span class="attr">v-on:after-leave</span>=<span class="string">"afterLeave"</span></div><div class="line">  <span class="attr">v-on:leave-cancelled</span>=<span class="string">"leaveCancelled"</span></div><div class="line">&gt;</div><div class="line">  <span class="comment">&lt;!-- ... --&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div></pre></td></tr></table></figure>
<p>这些钩子函数可以结合CSS transitions/animations使用，也可以单独使用。</p>
<p>当只用JavaScript过渡的时候，在enter和leave中，回调函数done是必须的。 否则，它们会被同步调用，过渡会立即完成。</p>
<p>推荐对于仅使用JavaScript过渡的元素添加v-bind:css=”false”，Vue会跳过CSS的检测。这也可以避免过渡过程中CSS的影响。</p>
<h3 id="多个元素的过渡"><a href="#多个元素的过渡" class="headerlink" title="多个元素的过渡"></a>多个元素的过渡</h3><ul>
<li>使用<transition-group>组件<ul>
<li>不同于<transition>，它会以一个真实元素呈现：默认为一个<span>。你也可以通过tag特性更换为其他元素</span></transition></li>
<li>元素一定需要指定唯一的key特性值</li>
<li>还可以改变定位。要使用这个新功能只需了解新增的v-move特性，它会在元素的改变定位的过程中应用</li>
</ul>
</transition-group></li>
<li>通过data属性与JavaScript通信，就可以实现列表的渐进过渡</li>
</ul>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><p>过渡可以通过Vue的组件系统实现复用。要创建一个可复用过渡组件，你需要做的就是将<transition>或者<transition-group>作为根组件，然后将任何子组件放置在其中就可以了。<br><a href="https://vuefe.cn/guide/transitions.html" target="_blank" rel="external">vue2过渡效果</a><br><a href="http://router.vuejs.org/zh-cn/advanced/transitions.html" target="_blank" rel="external">vue-router2过渡动效</a></transition-group></transition></p>
<h2 id="添加过渡效果"><a href="#添加过渡效果" class="headerlink" title="添加过渡效果"></a>添加过渡效果</h2><hr>
<p>下面我们将给路由切换以及Sidebar的下拉菜单加上过渡效果。</p>
<h3 id="vue-router过渡动效"><a href="#vue-router过渡动效" class="headerlink" title="vue-router过渡动效"></a>vue-router过渡动效</h3><p>给路由添加动态效果，可以在<router-view></router-view>外面添加transition，也可以在路由里面组件外面加一层transition。</p>
<ul>
<li>在路由里层组件添加transition</li>
</ul>
<p>这里我们分别在App组件和Login组件最外层添加：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">&lt;template&gt;</div><div class="line">  &lt;transition name=&quot;fade&quot;&gt;</div><div class="line">    ...</div><div class="line">  &lt;/transition&gt;</div><div class="line">&lt;/template&gt;</div></pre></td></tr></table></figure></p>
<p>然后我们添加fade的css过渡：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line">.fade-enter-active,</div><div class="line">.fade-leave-active &#123;</div><div class="line">    transition: opacity .4s</div><div class="line">&#125;</div><div class="line">.fade-enter,</div><div class="line">.fade-leave &#123;</div><div class="line">    opacity: 0</div><div class="line">&#125;</div></pre></td></tr></table></figure></p>
<ul>
<li>在<router-view></router-view>外面添加transition</li>
</ul>
<p>这里我们在App组件内嵌路由外层添加transition:<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">&lt;transition name=&quot;fade&quot;&gt;</div><div class="line">  &lt;router-view&gt;&lt;/router-view&gt;</div><div class="line">&lt;/transition&gt;</div></pre></td></tr></table></figure></p>
<p>上面两种方法都可以实现路由切换时的过渡效果。</p>
<h3 id="Sidebar下拉菜单过渡效果"><a href="#Sidebar下拉菜单过渡效果" class="headerlink" title="Sidebar下拉菜单过渡效果"></a>Sidebar下拉菜单过渡效果</h3><p>Sidebar组件中，下拉菜单过渡效果乍一看属于列表过渡。<br>但其实分析一下，我们便会发现它其实属于最简单的单个元素过渡。</p>
<ul>
<li>在下拉菜单外层<ul></ul>添加transition</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">&lt;transition name=<span class="string">"slide"</span>&gt;</div><div class="line">  <span class="xml"><span class="tag">&lt;<span class="name">ul</span> <span class="attr">class</span>=<span class="string">"nav child_menu slide"</span> <span class="attr">v-on:click.stop</span> <span class="attr">v-show</span>=<span class="string">"menu.class"</span>&gt;</span></span></div><div class="line">    <span class="tag">&lt;<span class="name">router-link</span> <span class="attr">v-for</span>=<span class="string">"childMenu in menu.childMenus"</span> <span class="attr">v-bind:key</span>=<span class="string">"childMenu.text"</span> <span class="attr">class</span>=<span class="string">"slide-item"</span> <span class="attr">:to</span>=<span class="string">"childMenu.href"</span> <span class="attr">tag</span>=<span class="string">"li"</span> <span class="attr">active-class</span>=<span class="string">"current-page"</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">a</span>&gt;</span>&#123;&#123; childMenu.text &#125;&#125;<span class="tag">&lt;/<span class="name">a</span>&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">router-link</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">ul</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">transition</span>&gt;</span></div></pre></td></tr></table></figure>
<ul>
<li>添加slide过渡样式<br>这里有个需要注意的地方，像height:auto和width:auto这种，是无法实现宽高的改变的，所以这里我们应该使用max-height和max-width来进行。</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">.slide &#123;</div><div class="line">  transition: all .5s ease-in-out;</div><div class="line">  overflow: hidden;</div><div class="line">  max-height: 100px;</div><div class="line">&#125;</div><div class="line">.slide-enter,</div><div class="line">.slide-leave-active &#123;</div><div class="line">  max-height: 0;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="给Services组件简单添加列表过渡效果"><a href="#给Services组件简单添加列表过渡效果" class="headerlink" title="给Services组件简单添加列表过渡效果"></a>给Services组件简单添加列表过渡效果</h3><p>本骚年这里就不啰嗦啦，直接上代码：<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div></pre></td><td class="code"><pre><div class="line">&lt;template&gt;</div><div class="line">  &lt;div id=&quot;list-demo&quot; class=&quot;demo&quot;&gt;</div><div class="line">    &lt;button v-on:click=&quot;add&quot;&gt;Add&lt;/button&gt;</div><div class="line">    &lt;button v-on:click=&quot;remove&quot;&gt;Remove&lt;/button&gt;</div><div class="line">    &lt;transition-group name=&quot;list&quot; tag=&quot;div&quot;&gt;</div><div class="line">      &lt;p v-for=&quot;item in items&quot; v-bind:key=&quot;item&quot; class=&quot;list-item&quot;&gt;</div><div class="line">                Service组件&#123;&#123; item &#125;&#125;</div><div class="line">            &lt;/p&gt;</div><div class="line">    &lt;/transition-group&gt;</div><div class="line">  &lt;/div&gt;</div><div class="line">&lt;/template&gt;</div><div class="line"></div><div class="line"></div><div class="line">&lt;script&gt;</div><div class="line">    export default &#123;</div><div class="line">        name: &apos;Sevices&apos;,</div><div class="line">        data() &#123;</div><div class="line">            return &#123;</div><div class="line">                items: [1, 2, 3, 4, 5, 6, 7, 8, 9],</div><div class="line">                nextNum: 10</div><div class="line">            &#125;</div><div class="line">        &#125;,</div><div class="line">        methods: &#123;</div><div class="line">            // 生成items数组的随机索引</div><div class="line">            randomIndex: function() &#123;</div><div class="line">                return Math.floor(Math.random() * this.items.length)</div><div class="line">            &#125;,</div><div class="line">            // 随机添加一项</div><div class="line">            add: function() &#123;</div><div class="line">                this.items.splice(this.randomIndex(), 0, this.nextNum++)</div><div class="line">            &#125;,</div><div class="line">            // 随机移除一项</div><div class="line">            remove: function() &#123;</div><div class="line">                this.items.splice(this.randomIndex(), 1)</div><div class="line">            &#125;,</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">&lt;/script&gt;</div><div class="line"></div><div class="line">&lt;style&gt;</div><div class="line">    .list-item &#123;</div><div class="line">        margin-bottom: 10px;</div><div class="line">    &#125;</div><div class="line">    </div><div class="line">    .list-enter-active,</div><div class="line">    .list-leave-active &#123;</div><div class="line">        transition: all 1s;</div><div class="line">    &#125;</div><div class="line">    </div><div class="line">    .list-enter,</div><div class="line">    .list-leave-active &#123;</div><div class="line">        opacity: 0;</div><div class="line">        transform: translateX(100px);</div><div class="line">    &#125;</div><div class="line">&lt;/style&gt;</div></pre></td></tr></table></figure></p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这里只是用到最简单的css过渡，但是vue的过渡效果以及过渡状态还是很牛逼的，大家有兴趣的可以去看看<a href="https://vuefe.cn/guide/transitions.html" target="_blank" rel="external">官方文档</a>然后多尝试一下呢，酷酷的。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/vue2-notes/5-transition-animation" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://vue2-notes.godbasin.com/5-transition-animation/index.html#/app/services" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">
			查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a>
			<br>
			更欢迎来<a href="https://godbasin.github.io/front-end-playground">被删的前端游乐场</a>边撸猫边学前端噢
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	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#过渡效果"><span class="toc-number">1.</span> <span class="toc-text">过渡效果</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#transition封装组件"><span class="toc-number">1.1.</span> <span class="toc-text">transition封装组件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#过渡的-CSS-类名"><span class="toc-number">1.2.</span> <span class="toc-text">过渡的-CSS-类名</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#JavaScript-钩子"><span class="toc-number">1.3.</span> <span class="toc-text">JavaScript 钩子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#多个元素的过渡"><span class="toc-number">1.4.</span> <span class="toc-text">多个元素的过渡</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#参考"><span class="toc-number">1.5.</span> <span class="toc-text">参考</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#添加过渡效果"><span class="toc-number">2.</span> <span class="toc-text">添加过渡效果</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#vue-router过渡动效"><span class="toc-number">2.1.</span> <span class="toc-text">vue-router过渡动效</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Sidebar下拉菜单过渡效果"><span class="toc-number">2.2.</span> <span class="toc-text">Sidebar下拉菜单过渡效果</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#给Services组件简单添加列表过渡效果"><span class="toc-number">2.3.</span> <span class="toc-text">给Services组件简单添加列表过渡效果</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
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